A low-cost, multi-touch whiteboard system made from a couple of IR light pens (DIY), special software and a Nintendo Wiimote? Seems like you can make or control almost anything with a Wiimote!
Johnny Chung Lee of Carnegie Mellon University figured that since the Wii tracks infrared lights, practically any surface could be turned into a multi-touch screen.
View the (very concise and informative) Wiimote multi-touch display hack video below to learn more.
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